Part A A 1.0-L buffer solution is 0.115 Min HNO2 and 0.185 Min NaNO2 Dotarmine t
ID: 1035825 • Letter: P
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Part A A 1.0-L buffer solution is 0.115 Min HNO2 and 0.185 Min NaNO2 Dotarmine the ooncentrations of HNO2 and NaNO, after addition of 1.4 g HCL Express your answers using three significant figures separated by a comma. ?? HNO2). NaNO ]173.,.116 Submit Previous Answers Request Answer Incorrect; Try Again; 4 attempts remaining Part B Determine the concentrations of HNO2 and NaNO; ater addition of 1.4 g NaOH Express your answers using three significant figures separated by a comma. Submit Request AnswerExplanation / Answer
1 L buffer solution is 0.115 M in HNO2 (0.115 moles of HNO2) and 0.185 M in NaNO2 (0.185 moles of NaNO2)
Part A :- Determination of the concentrations of HNO2 and NaNO2 after addition of 1.4 g HCl
no. of moles of added HCl = given mass of HCl / molar mass of HCl
molar mass of HCl = 1.01 + 35.45 = 36.46 g/mol
= 1.4 g / 36.46 grams
= 0.0384 moles
At equilibrium:- HNO2 <--------> H+ + NO2-
0.115 mol 0.185 mol
On addition of HCl , H+ ions shifts equilibrium to the left.
HNO2 <--------> H+ + NO2-
0.115 + 0.0384 0.185 - 0.0384
0.1534 mol 0.1466 mol
Concentrations after addition of HCl concentration is 0.153 M HNO2 and 0.146 M NaNO2
Part B :-Determination of the concentrations of HNO2 and NaNO2 after addition of 1.4 g NaOH
no. of moles of added NaOH = given mass of NaOH / molar mass of NaOH
molar mass of NaOH = 23 + 16 + 1 = 40 g/mol
= 1.4 g / 40 grams
= 0.035 moles
At equilibrium:- HNO2 <--------> H+ + NO2-
0.115 mol 0.185 mol
On addition of NaOH ,OH- ions removes H+ ions and shift of the equilibrium to the right.
HNO2 <--------> H+ + NO2-
0.115 - 0.0384 0.185 + 0.0384
0.0766 mol 0.2234 mol
Concentrations after addition of 1.4g of NaOH concentration is 0.0766 M HNO2 and 0.2234 M NaNO2
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